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2. ACCOUNTS RECEIVABLE (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss [Abstract]    
Balance at beginning of period $ 7,098 $ 3,977
Charged to costs and expenses 2,902 4,618
Write-offs, net of recoveries 0 (1,497)
Balance at end of period $ 10,000 $ 7,098